revert_to_last_solvable · Ice Puzzle MCP: Risk & Policy

WHAT IT DOES

What revert_to_last_solvable does on Ice Puzzle

AI agents use revert_to_last_solvable to create or update resources in Ice Puzzle — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ice Puzzle environment.

WHY IT NEEDS A POLICY

Why revert_to_last_solvable needs a policy

This tool modifies level data by replacing the current state with a prior saved state. While it restores rather than deletes, it overwrites the current work and is reversible (can be reverted again), classifying it as Write rather than Destructive. Severity is medium because misuse could lose recent design work, but the operation is recoverable via undo or revert commands.

From the tool's definition Tool reverts level state to 'the latest known solvable state,' which modifies the current level design by restoring a previous version. The description indicates it performs a state restoration operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

revert_to_last_solvable Rate-limited

revert_to_last_solvable stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "revert_to_last_solvable": {
      "limits": [
        {
          "counter": "revert_to_last_solvable_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Ice Puzzle, so you can run agents against it safely.

FAQ

Questions about revert_to_last_solvable

What does the revert_to_last_solvable tool do? +

Restore the latest known solvable state. It is categorised as a Write tool in the Ice Puzzle MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on revert_to_last_solvable? +

Register the Ice Puzzle MCP server in PolicyLayer and add a rule for revert_to_last_solvable: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Ice Puzzle. Nothing to install.

What risk level is revert_to_last_solvable? +

revert_to_last_solvable is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit revert_to_last_solvable? +

Yes. Add a rate_limit block to the revert_to_last_solvable rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block revert_to_last_solvable completely? +

Set action: deny in the PolicyLayer policy for revert_to_last_solvable. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides revert_to_last_solvable? +

revert_to_last_solvable is provided by the Ice Puzzle MCP server (wmoten/ice-puzzle-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.